HP 8647A - Page 121

506
Description
Cause
What
To Do
507
Description
Cause
What
To Do
508
Description
Cause
What
To Do
FM mult cal restore failure
After detecting a failure in comparing calibration data
between
RAM and the calibration ROM, a data restore
was attempted unsuccessfully.
There is either a failure in writing data
to RAM or in
reading data from the calibration
ROM.
The calibration ROM can be verified by replacing the
A5 assembly. The calibration ROM is contained in the
assembly.
If the failure is still present after replacing the A5
assembly, replace the A3 assembly, which contains
the
RAM.
Output level cal restore failure
After detecting a failure in comparing calibration data
between
RAM and the calibration ROM, a data restore
was attempted unsuccessfully.
There is either a failure in writing data to
RAM or in
reading data from the calibration
ROM.
The calibration ROM can be verified by replacing the
A6 assembly. The calibration ROM is contained in the
assembly.
If the failure is still present after replacing the A6
assembly, replace the A3 assembly, which contains
the
RAM.
Attenuator calrestore failure
After detecting a failure in comparing calibration data
between
RAM and the calibration ROM, a data restore
was attempted unsuccessfully.
There is either a failure in writing data to
RAM or in
reading data from the calibration
ROM.
The calibration ROM can be verified by replacing the
A7 assembly. The calibration ROM is contained in the
assembly.
If the failure is still present after replacing the A7
assembly, replace the A3 assembly, which contains
the
RAM.
5c.2 Service Error Messages